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netfilter: nf_tables: hold mutex on netns pre_exit path

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commit 3923b1e4406680d57da7e873da77b1683035d83f upstream.

clean_net() runs in workqueue while walking over the lists, grab mutex.

Fixes: 767d1216bf ("netfilter: nftables: fix possible UAF over chains from packet path in netns")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso
2022-05-30 18:24:05 +02:00
committed by Greg Kroah-Hartman
parent 89ef50fe03
commit 9ea55b9f43
1 changed files with 4 additions and 0 deletions
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4
net/netfilter/nf_tables_api.c
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@@ -9746,7 +9746,11 @@ static int __net_init nf_tables_init_net(struct net *net)
static void __net_exit nf_tables_pre_exit_net(struct net *net)
{
struct nftables_pernet *nft_net = nft_pernet(net);
mutex_lock(&nft_net->commit_mutex);
__nft_release_hooks(net);
mutex_unlock(&nft_net->commit_mutex);
}
static void __net_exit nf_tables_exit_net(struct net *net)